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On a builder which has /tmp mounted nexec, the ARM64 generation of the sycall table will fail: [snip] |perf-1.0/tools/perf/arch/arm64/entry/syscalls//mksyscalltbl: /tmp/create-table-6VGPSt: Permission denied [snip] To avoid the permission denied error, we must instruct the perf build to place temporary files in an appropriate directory (versus always using /tmp). To do this, we need both a kernel source change to perf, and a recipe change to pass the temp directory in by a TMPDIR variable. The linux-yocto has a reference kernel change: [perf arm64: Fix generate system call table failed with /tmp mounted with noexec], that has also been submitted upstream mailing list linux-perf-users@vger.kernel.org (From OE-Core rev: d819e7fa76e2b732aa7c33ab0e9a834781090824) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Reviewed-by: Bruce Ashfield <bruce.ashfield@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.